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How to Use TOHNICHI power torque tools tighten screws accurately when they are used correctly. ■ Calculating the compressor capacity. Power Torque Tools The compressor capacity necessary to drive a power torque tool can be determined by the volume of air required to tighten each screw (m³/piece) and the number of screws requiring tightening (piece/h). Provide some allowance, however, for leakage and future system expansion. 1 Volume of air ＝ Volume of air required to × Number of screws to × Thread ratio× 60 tighten each screw be tightened consumption [m³/min] [m³/piece] [Piece/h] [Thread/10] Volume of air required to tighten each screw : Volume of air (standard air) necessary for tightening one screw (number of threads tightened = 10). Values are given in the specification column for each tool. Number of screws to be tightened : Number of screws to be tightened per hour. Thread ratio : The number of threads to be tightened divided by 10, the standard number of threads. For example, when the number of threads is 6, the ratio is 0.6. Example: When four thousand M5 screws (number of threads: eight) are to be tightened using several U500CN tools. (volume of air required to tighten each screw: 0.0031 [m³/piece]) 1 Volume of air consumption =0.0031×4000×0.8× [m³/min] 60 =0.165 [m³/min] Compressor output =0.165×6.5 [kW] =1.07 [kW] (The motor output necessary for the compressor to discharge 1 [N] is 6.5 [kW] at a gauge pressure of 0.7 [MPa]) Cost of tightening power =0.0031×4 [yen/piece] =0.0124 [yen/piece] (Cost of compressed air is 4 [yen/piece] at a gauge pressure of 0.7 [MPa], including the costs of electricity, compressor depreciation, etc.) 346 TOHNICHI TORQUE HANDBOOK Vol.8